Pump.



c. L. NEwc0M.

PUMP.

APPLICATION FILED JUNE 5,1913.

Patjnted June 6, 1916.

UNITED STATES PATENT l OFFICE.

CHARLES I4. NEWCOMB, HOLYOKE, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO WORTHINGTON PUMP AND MACHINERY CORPORATION, 0F NEW YORK,

N. Y., A CORPORATION OIF/VIRGINIA.

rum?.

Specification of Letters Patent.

Patented June 6, 1916.

vApplication led J'une 6, 1913. Serial No. 772,052.

siding at Holyoke, county of Hampden, and

State of Massachusetts, have invented certain new and useful Improvements in Pumps, fully described and represented in vthe following specification and the accompanying drawings, forming a part of the same. v y

This invention relates to improvements in pumpingapparatus, and particularly to a double-acting, continuous-flow power pumping apparatus for deep wells.

The object of this invention is to provide a pumping apparatus of the class described, by which the power-head may be placed at one side of the well in order to allow ready access to the well and to that part of the pumping apparatus contained therein, while at the same time the strain to which the drive mechanism is subjected will be as nearly balanced as possible.

With this object in View, an apparatus embodying my invention comprises the features, details 0f construction and combination of parts, which will first bel described in connection with the accompanying drawings and then more particularly pointed out in the claims. y

In the drawings, Figure 1 is a front elevation of a pumping apparatus embodying the preferred form of my invention, a part of the well and cylinder being shown in section. Fig. 2 is a vertical section of the same, with a part of the well-head and casing in elevation. Fig. y3 is a detail view, showing another modification of cam device which may be used.

Referring to the drawings, 1 indicates the usual well casing, 2 the pump cylinder, 3 the lower piston, 4 the upperpiston, 5 the solid piston rod, and -6 the hollow piston rod of the usual double-acting deep-well pump. The cylinder 2 is united to the well-head 7, having a discharge pipe as indicated, for example, at 8, the said well-head being provided as at 9 with a stuing-box, through which the tubular pump rod 6 passes. vThe solid pump rod projects above the end of the hollow pump rod 6 in the usualway.

Suitable means is provided for guiding the y pump rods at their upper ends the present example showing the ends of said pump to each other.`

rods secured to crossheads 10, 11, respectively, which slide on guide rods 12 suitably secured at their lower endsV in a base 13, and at their upper ends in arms 14 projecting from pedestals 15 carried bystandards 15 mounted on the said base 13.

For the purpose of operating the pump rods, I employ a single cam device arranged to operate two levers, each of which is connected to its respective pump rod, the means by which the cam drives these levers being arranged to contact with the cam at substantially diametrically opposite points. In order that the desired arrangement of the points of engagement between the levers and the cam may be obtained, the said le- Ivers are most advantageously constructed as bell crank levers.

In the preferred embodiment of the invention, the cam, indicated at 16 (Fig. 2) is mounted on a shaft 17 journaled in suit# vable bearings in the standards 15T, said shaft being provided with a gear wheel '18, which may be'driven through a pinion `19 from a suitable shaft 20, also advantageously journaled in the pedestals 15, this shaft 20 receivingpower from any suitable source, not shown.l The cam 16 is, in the present instance, of an irregular configuration, substantially heart-shaped, its periphry carrying the principal operating surace.

At-21 is indicated a bell crank lever, whose arms are arranged at an acute angle, while at 22 is indicated a lower bell crank lever, whose arms are at an obtuse angle The upper bell crank-lever 21- is constructed as a truss', formedv of two triangulr frames placed side by side, with an intervening space between, these two frames being secured together in any suitable way to constitute one complete 'bell crank. A single piece forked bell crank ample, the frames are united by a common boss 23, mounted on a shaft or axle 24 carried in the pedestals 15 mounted on the.

'may be used, however. In thepresent eX- vsuitable manner, as for example, by means of a pair of connecting rods 32, each pivoted to one of the side frames of the bell crank 22 and to the up-turned ears 33 of a head, which is suitably secured, as by bolting, to the hollow pump rod, as shownv in Fig. 1. The bell-crank 22 carries a roller 34 which engages the cam 16.

The operation of the device thus far described is as follows: The pinion 19 being rotated by suitable power through the shaft 20, the gear-wheel 18 will be set in rotation and with it the cam 16. rlhe weight of the respective pistons, pump rods and their attached parts will tend to swing the bell cranks 21, 22, respectively, so as to maintain their rollers 28 and 34, in contact with the outer face or periphery of the cam 16, whereby the rotation of the cam will cause the oscillation of the bell cranks, which in turn, will reciprocate their respective pump rods. In the embodiment of the invention shown,

L'the arms of the two bell cranks which are driven by the cam 16 are of equal length, while those arms of the said `bell cranks which are connected to the pump rods are also of equal length, the latter pair of arms being such as to permit the ower head to be kept considerably to one side of the wellhead in order to give free access to the well and the parts of the pumping. apparatus contained therein. Furthermore, as will be seen from Fig. 2, the rollers 28 and 34 of the respective bell cranks contact 'with the cam 16 at diametrically opposite points, so that the weight of the pump rod and its load upon the upper bell crank 21 is transmitted to the cam in direct opposition to the load put upon the cam through the bell crank 22 from its pump rod and load. By this arrangement, the strains to which the cam and shaft 17 are Isubjected will be reduced as much as possible. It will be noted that at certain periods during the rotation of the camA each bell crank lever will be operated to lift its pump rod, during which time the cam surface is subjected to the pressure transmitted through the bell crank from the load of water on the respective piston. At other portions of the.

revolution of the cam, the weight of the pump rods .will tend to swing their respective bell cranks in directions opposite to that yheretofore mentioned, so that at' such time the respective bell crank is not being driven by the peripheral surface of the cam, but, instead, the cam is merely permitting this return movement of the bell crank, owing to the reduced radius of the cam at this part. For the sake of clearness in explanation, I have termed that portion of the periphery of the cam which acts to move the bell crank in a direction to lift the water, the drivingcam surface. In the embodiment of the invention shown, this driving-cam surface embraces more than 18()D of the cam. As a result of this', combined with the arrangement of the bell crank levers so that their points of contact with the periphery of said cam are opposite, or 1800 apart, the bell crank levers, at a certain position of the cam, are both being driven to lift their pump rods. This action takes place just as each pump piston is nearly completing its upward stroke. By this means, the column of water is kept continually in motion upward, thereby avoiding the necessity of repeatedly overcoming the inertia of the water, as would occur with a non-continuous pumping device. It is to be noted, furthermore, that since the driving cam surface occupies more than 180o of arc, the remainder of the cam surface occupies less than 180, and consequently the cam permits a quick return movement of each pump rod.

Since in practice it sometimes occurs that the presence of sand, or the like, in the pump cylinder creates sufficient friction to prevent the pistons from descending by their own weight and that of vtheir attached parts, I have provided means whereby the cam may pull the bell crank levers in a direction to push the pump rods downward. In the construction 'shown in Fig. 2, this result is accomplished by providing the cam 16with an inside cam face indicated at 16%, and each bell crank lever is provided with an arm as indicated at 21a, 22a, respectively, these arms carrying rollers as indicated at 35, which ride on the said inside cam surface 16a.

It will be observed from the drawings that if at any time it is desired to remove the pistons and pump rods, or the cylinder, it is only necessary to disconnect the bell cranks 21, 22, from their respective'connecting rods 26, 32, and remove the rollers 35, whereupon the outer or forward ends of the bell cranks maybe swung upwardly and backwardly out of the way.

In Fig. 3 is illustrated a modification of the inside cam, which .cam is shown as eXn tending less than 180. This inside cam is indicated at 16". With this modification, the bell crank levers may be disconnected from their connecting rods and swung out of the wav without the necessity of removing vthe rollers 35, which are intended to operate in conjunction with said inside cam.

What I claim is 1. The combination, with a pair of pump rods, of an acute angled bell crank, having one arm connected to one pump rod, an obinse angled bell crank having one arm connected to the other pump rod, and a single cam located on the same side of the pump rods as the fulcrum points of the bell cranks and provided with an operating-surface arranged to operate the respective other arms ot' the bell cranks, and means for actuating said cam.

2. The combination, with a pair of pump rods. and a pair of levers arranged to operate the latter, of a single cam device arranged to actuate both levers in a direction to litt 16 the pump rods, said cam device having an additional cam-surface arranged to actuate both levers n1 a direction to push the pump rods downward.

3. The combination, with a pair of pump rods, and a pair of levers arranged t0 operate the latter, of a single cam device arranged to actuate both levers in a direction to lift the pump rods, said cam device having an additional cam-surface arranged to actuate both levers in a direction to push the pump 'rods downward, said additional cam-surface being formed to free the levers during a p01'-A lion of the movement of the cam, whereby the levers may be thrown back.

In testimony whereof, I have hereunto vset in v band. in the presence of two subscribing witnesses.

CHARLES L. NEVCOMB.

Witnesses:

il". M'. FLHMING, Jim1-:s P. CAYDON, Jr. 

